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High frequency circuit having a transformer with controlled interwinding coupling and controlled leakage inductances

  • US 5,546,065 A
  • Filed: 09/07/1995
  • Issued: 08/13/1996
  • Est. Priority Date: 09/13/1991
  • Status: Expired due to Term
First Claim
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1. A high frequency circuit comprisinga transformer comprisingan electromagnetic coupler havinga magnetic medium providing flux paths within the medium, andwindings enclosing said flux paths at separated locations along said flux paths, andan electrically conductive medium arranged in the vicinity of said electromagnetic coupler, said electrically conductive medium defining a boundary within which flux emanating from said electromagnetic coupler is confined and suppressed, said conductive medium thereby reducing the leakage inductance of one of said windings by at least 25%,circuitry connected to one of said windings to cause current in said one of said windings to vary at an operating frequency above 100 KHz, andelectrically conductive bands, said bands being configured to cover essentially all of the surface of said magnetic domain at locations which are not covered by said first conductive medium, said bands being configured to preclude forming a shorted turn with respect to flux which couples said windings, said bands also being configured to restrict the emanation of flux from said surfaces which are covered by said bands at said operating frequency.

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